TaskFactory::FromAsync<TResult> Method (Func<AsyncCallback^, Object^, IAsyncResult^>^, Func<IAsyncResult^, TResult>^, Object^, TaskCreationOptions)
Creates a Task<TResult> that represents a pair of begin and end methods that conform to the Asynchronous Programming Model pattern.
Assembly: mscorlib (in mscorlib.dll)
public: generic<typename TResult> Task<TResult>^ FromAsync( Func<AsyncCallback^, Object^, IAsyncResult^>^ beginMethod, Func<IAsyncResult^, TResult>^ endMethod, Object^ state, TaskCreationOptions creationOptions )
Parameters
- beginMethod
-
Type:
System::Func<AsyncCallback^, Object^, IAsyncResult^>^
The delegate that begins the asynchronous operation.
- endMethod
-
Type:
System::Func<IAsyncResult^, TResult>^
The delegate that ends the asynchronous operation.
- state
-
Type:
System::Object^
An object containing data to be used by the beginMethod delegate.
- creationOptions
-
Type:
System.Threading.Tasks::TaskCreationOptions
The TaskCreationOptions value that controls the behavior of the created Task<TResult>.
Return Value
Type: System.Threading.Tasks::Task<TResult>^The created Task<TResult> that represents the asynchronous operation.
Type Parameters
- TResult
The type of the result available through the Task<TResult>.
| Exception | Condition |
|---|---|
| ArgumentNullException | The exception that is thrown when the beginMethod argument is null. -or- The exception that is thrown when the endMethod argument is null. |
| ArgumentOutOfRangeException | The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. For more information, see the Remarks for FromAsync |
This method throws any exceptions thrown by the beginMethod.
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 5.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1